Synthesis and spectrophotometric studies of charge transfer complexes of benzamide with picric acid in different polar solvents

Synthesis and spectrophotometric studies of charge transfer complexes of benzamide with picric... The charge transfer complexes of the donor benzamide (BZ) with the π-acceptor picric acid (PAH) have been studied spectrophotometrically in various solvents such as carbon tetrachloride, ethanol, and methanol at room temperature using an absorption spectrophotometer. The results indicate that the formation of a CT complex in less polar solvent is comparatively high. The stoichiometry of the CT complex was found to be 1:1. The physical parameters of the CT complex were evaluated by the Benesi–Hildebrand equation. The data are discussed in terms of the formation constant (K CT), molar extinction coefficient (ε CT), standard free energy (∆G°), oscillator strength (f), transition dipole moment (μ EN), resonance energy (R N), and ionization potential (I D). The results indicate that the formation constant (K CT) for the complex was shown to be dependent upon the nature of the electron acceptor, donor, and polarity of the solvents used. It was also observed that a charge transfer molecular complex is co-stabilized by hydrogen bonding. The formation of the complex has been confirmed by UV–Vis, FT-IR, 1H NMR, and TGA/DTA techniques. The structure of the CT complex is [(BZH)+(PA)−], and a general mechanism for its formation is also proposed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Synthesis and spectrophotometric studies of charge transfer complexes of benzamide with picric acid in different polar solvents

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Publisher
Springer Netherlands
Copyright
Copyright © 2013 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-013-1474-8
Publisher site
See Article on Publisher Site

Abstract

The charge transfer complexes of the donor benzamide (BZ) with the π-acceptor picric acid (PAH) have been studied spectrophotometrically in various solvents such as carbon tetrachloride, ethanol, and methanol at room temperature using an absorption spectrophotometer. The results indicate that the formation of a CT complex in less polar solvent is comparatively high. The stoichiometry of the CT complex was found to be 1:1. The physical parameters of the CT complex were evaluated by the Benesi–Hildebrand equation. The data are discussed in terms of the formation constant (K CT), molar extinction coefficient (ε CT), standard free energy (∆G°), oscillator strength (f), transition dipole moment (μ EN), resonance energy (R N), and ionization potential (I D). The results indicate that the formation constant (K CT) for the complex was shown to be dependent upon the nature of the electron acceptor, donor, and polarity of the solvents used. It was also observed that a charge transfer molecular complex is co-stabilized by hydrogen bonding. The formation of the complex has been confirmed by UV–Vis, FT-IR, 1H NMR, and TGA/DTA techniques. The structure of the CT complex is [(BZH)+(PA)−], and a general mechanism for its formation is also proposed.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Nov 29, 2013

References

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